i believe its located in the air box tube in front of throttle body valve..you have to take the inner engine cover between the seats to get access to the sensor
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On the 2004 Chevy Express with a 4.3L engine, the crankshaft position sensor is located at the rear of the engine, near the transmission bellhousing. It is typically mounted on the engine block and can be accessed from underneath the vehicle. To replace or inspect the sensor, it's often necessary to remove components that may obstruct access.
To change the knock sensor on a 2004 Chevy Suburban, first disconnect the battery to ensure safety. Locate the knock sensor, which is usually found on the engine block or intake manifold. Remove the electrical connector and unbolt the sensor using the appropriate socket. Install the new sensor by reversing the process, ensuring it's tightened to the manufacturer's specifications, and reconnect the battery.
On a 2004 Chevy Astro, the camshaft sensor is located in the front of the engine. It is on the left side of the timing cover behind the camshaft sensor.
To change the oxygen sensors on a 2004 Chevy Express 2500, first, ensure the vehicle is cool and safely elevated. Locate the oxygen sensors, usually positioned on the exhaust manifold and downstream of the catalytic converter. Disconnect the electrical connectors and use a specialized O2 sensor socket to unscrew the sensors. Install the new sensors by threading them in place, reconnect the electrical connectors, and clear any diagnostic trouble codes if necessary.
The 2004 Chevy Malibu crankshaft position sensor location is dependent upon the type of engine. In most cases the crankshaft position sensor is on the back of the engine.
you have to pull off the intake they are under there. you have two you might as well replace both